I started to work on autosave support for Moodle 2.0. It uses AJAX call to periodically save the content of a given textarea/wysiwyg field into a temporary area. It may be used to backup forum posts, quiz essays, etc. on the fly during the text composition. It should help avoid data loss in case of accidental browser crash or close, pressing “back” button , lost connection etc.
At the moment, several design decisions are needed. I am waiting for the feedback and comments from the core team. Check MDL-18014 for more information.